System of television



June 17, 1930. P. TORRABADELLA 9 2 SYSTEM OF TELEVISION Filed Jan. 21, 1927 2 Sheets-Sheet 1 June 17, 1930. P. TORRABADELLA v SYSTEM OF TELEVISION Filed Jan. 21, 1927 2 sheets Sheet 2 Patented June 17, 1930 UNITED STATES PATENT- OFFICE PEDRO TQBRABADELLA, F UONGE'POION DEL URUGUAY, ARGENTINA SYSTEM OF TELEVISION Application filed January 21,- 1927. Serial No. 162,61 7.

The invention is based on and consists of a combination of'the known principlesof telephotography, of the harmonic telegraphy and of the magnetizing of the polarized light, discovered by Faraday.

Referring to the accompanying drawing,

Fig. 1 is the transmitting apparatus and Fig.

2 is the receiving apparatus.

The transmitting apparatus comprises a photographic camera B, the back of which is formed in the shape of a honeycomb hav- 2 ing a plurality of cells C of any shape and conventional size. Each of the cells contains a portion of matter sensible to the variations of the intensity of the light which varies the current in the circuit in which they are in serted. This circuit is traversed by an intermittent current, the interruptions of which are produced by means of the prolonged vibrations of a diapason D, thus resulting in a determined andinvariable tone.- or rhythm. The characteristic modulation resulting from a predetermined number'of vibrations per second, the intensity of which is modified in the photoelectrogenous cellules O by effect of the changes oflight, is printed by induction on a conductor by means of transformers having secondaries F and maries E.

Each of the cellules forms part of a different circuit traversed by an electric current of different intensity; that is, the vibrating frequency of each diapason D is different so that a predetermined number of different vibrations is printed on a single conductor. These vibrations do not obstruct or interfere with one another; each of t-hem carrying the variations of the light which forms the diflerent dots of the analyzed image.

This compound modulation is amplified by analyzed in the transmitting apparatus.

pri-

the amplifiers G and transmitted by an antenna. w

The receiving apparatus shown in Fig.- 2 comprises amplifiers J into which the wave is received from the sending antenna. 'Connected to the amplifiers is a microphonic relay K through which the modulations pass. The modulation is analyzed through primaries of a plurality of monotelephone bob bins M, the different vibrating tones 0f ,.60 which correspond to the vibrating tones of the diapasons of .the transmitter, thus reproducing in an equal number of circuits the same characteristics of each dot of the image Each of these circuits comprises a cellule O disposed on a plane in the place corresponding to the cellule of the transmitting apparatus to which it is analogous and which also vibrates in the same tone. These cellules of the receiving apparatus are each composed of two nicols, the axes of Which are crossed, intercepting in this way the nicolwhich analyzes the .light projectedover the polarthe pencil of rays of polarized light passes,

and the latter passes through a substance active to said-.hght. The pencil of rays moves around more or loss following the variations of intensity of the current, allowing the passage of a larger or smaller quantity of light in each receiving cellule in proportion to the variations of light of each transmitting cellule.

The imagesthat are in front ofthe transmitting apparatus are thus reproduced in the receiving apparatus, dot by dot with changes of osition and-luminosity simultaneously in bot apparatus.

In accordance with all that is expressed and described I claim as of my exclusive property and rights A system of television comprising a transmitting and receiving apparatus, said trans- -mitting apparatus comprising a light sensitive cell having a plurality of cells sensible to the different variations of the intensity of light and adapted to be variedby the passage of light through images brought in its vicinity, each of said cells being connected in cirsuit with the rimary of a transformer, a tuning fork having a predetermined frequenc and a source of supply, each of said 5 trans ormers having their secondaries connected in zones with an amplifier, an antenna connected to said amplifier, whereby upon the change of intensity of light upon said light sensitive cells, the difi'erent vibrations 10 of the tanning forks inducing difierent impulses into the secondaries of said transformers, said receiving apparatus comprising an amplifier connected to .an antenna for receiving the Waves from said transmitting 15 apparatus a relay in circuit with said amplifier,.a plurality of tuned reeds having frequencies corresponding to the frequencies of the forks in saidtransmitting atus connected in circuit with said re- 7 a corresponding number of mere, and a source of supply, each ds being connected to correspondaelis in a light sensitive cell, a light, and a reproducing screen, being adapted to cast light rays reproduced on said screen dotby zne position and luminosity. whereof I afix my signature. R1) TORRABADELLA.

said cell whereby the-picture trans- 

